Automatic telephone system



Sept. 18, 1923. 1,468,249

w. T. POWELL AUTOMATIC TELEPHONE SYSTEM Filed 1919.

2 Shee Fle l INTERRUPTER.

FINDER.

CONTACT X CLOSES BEFORE ASEOCI TED CONTACTS BREAK.

NOTES TO Got-(HECTOR- A LLOTTER INVENTOR WINFRED T. POWELL.

BY 11 W ATTORNEY Sept. 18,1923. 1,468,249

w. T. POWELL AUT OMATI C TELEPHONE SYSTEM Fil ed Oct. 25, 1919 2Sheets-Sheet 2 CONNECTOR SWITCH CONTROL LER SWITCH INVENTOR WlHFRED TPOWELL.

BY A? cz lz m ATTORNEY ture and back contact of the cutoff relay 7 y toground; The relays and LR are energized in this circuit, and the relay 5through its armature and frontcontact closes conductor 6. leading to;'a; tone device which will apply atoneto the calling line until this linehas been connected to an idle trunk.

This tone therefore indicates to the "subscriber that'he should notoperate his dial sender until thetone ceases, otherwise some of thedirective impulses will be lost and a magnet, and allotter brush 1Oto'ground.

Under the control of this circuit the motor magnet 9 advances thebrushes of the finder switch until the test brush 11 encounters testterminal 12 of the calling line which I hasbeen grounded by theenergization of the line relay LR. When this occurs, a circuit is closedfrom grounded battery, resistance, outer armature and front contact ofrelay 5, allotter brush 7, lower winding of relay 8 to ground over testbrush 11. It

calling line to the selected idle trunk.

will be noted that this last described circuit shunts the'motor' magnet9 of the finder switch to stop the same, and also energizes theswitching relay 8 which connects the As soon as the switchingrelay 8 hascompleted its operation, the stepping relay SR station circuitsinseries.

of the connector is energized over the trunk conductors 13 and14 andtheline'and'sub- Under the control of this circuit, stepping relay SRoperates its armatures and in turn causesthe energization of relay 34The motor, magnet 15 ofthe controller is thereupon energized in acircuit traceable from grounded battery,

winding of the motormagnet 15, conductor 16, outerarmature and frontcontact of the stepping relay SR, left hand back contact and armature ofrelay 17 to ground. .The

. motor magnet 15 is energized in this circuit and attracts its armatureto complete an operating circuit forthe relay 17 extending from groundedbattery, resistance, winding of the relay 17, its continuity spring 18and contact,'right hand front contact and arinature of the motormagnet15, conductor 19, brush 20 of the controller in its home position,lowermost armature and back contact of switching relay 21 to ground. Therelay 17 which remains energized until the time of release when itdeenergizes to permit the controller switch to move to its homeposition, is operated and attracts its armatures, At its continuityspring 18 and 7 armature, itf closes 'a locking circuit for itself toground. At theouterlefthand'armature and back contact of relay 17, theenergizing circuit of the motor mag-net.15 of the con j trollerisinterrupted, 'causing the controller to moveinto its next positionwhich hasbeen designated a normal position.

left handarmature and front contact of is- ..As soon as-therelay 17attracts its armatures, a clrcultisclosed from ground, outer V lay17,'conductor 30, holding brush 31 or,

the finder switch, winding'of the cut-oftre i This circuit;

lay CO to grounded battery.

also places a guarding potential on the testterminal of the calling lineat the connector to prevent its seizure i as a called line.- The cut-offrelay operating'disconnects the line relay and also the 'dial tonepreviously men'- tioned. At the right hand armature and continuityspring 18 of the relay 17 ground isapplied to conductori32, upperwinding. of the switching relay 8 'to grounded battery to hold thisrelay energized after the allotter has broken itsoriginal energizingwinding.

As soon asthe controller brush 22 leaves its honie position, theenergizing circuit of the relay 23which isenergized as" long as theallotter brushes are standing in a'po-' sitiontoassign an idle trunk,releases. The

energizing circuit of'therelay 23 extends from ground, winding ofthis'relay, allotter brush 24:, conductor 25,-controller' brush 22 initshorne position, conductor 26, outer armature and back contact of relay17, arma ture and back contact of' the motor magnet 15, conductor 27,winding of the motor magnet 15 to grounded battery.

When the relay 231deenerg1zes, it closes a circuit for a relay28'which'co-opera-tes in the control ofthe motor magnet 29 of the theallotter will advance its 'brushes slowly enough so that it willhaveanopportunity] to test for idletrunks. The relay 28 is en-f ergized over acircuit controlledat the back contact and armature of theimagnet 29and'at the back contact and armature of relay 23. The relay 28 attracts itsarmature to 1 close an operating circuit for the motor magnet 29 oftheallotter, so that this magrelay 28 causing the relay 28 aspentheoperating circuit of the motor magnet; 29;

operation between the relay'28 and the magnet 29 with the result thatthe allotter operates slowly enough to insure accuracy" in testing.Under the control of thecircuits just described, the moton magnet 29 adIt will thus be seen that there is an intervances the brushes of theallotter untilthef allotter brush 24 engages a test terminal on I whichthere is battery potential applied over a. circuit similar tothatdescribed as including the controller brush 22 in its 105 allotterswitch. This relay 28 insures that net will advance the brushes of theswitch one step. It also opens the circuit of the home lposition. Whensuch aitest terminal is reached, the relay-23 will be energized toopen'the circuit of the controlling relay 28 and relay 23will remainoperated until the:

newly assigned trunk is taken for use. The apparatus is now in conditionto receive the impulses from the dial senderat the substation A; Sinceonly av connector switch has'be'en shown, it is necessary'to transmit atens'series of impulses to advance thereon nector switch-to adesired'group of lines at the close of this series of impulses.

and thereafter directly operate. the switchto select a wanted line inthe'selectedgroup, In accordance V with the present vinvention theconnector is arranged so that it neednot be advanced anumber of stepsequal to the number of impulses transmitted from. the dial sender, butassumes a: setting under oer tain conditions predetermined by thecontroller which in the case of the tens seriesof impulses acts as atranslating device.

' lt-will'first be assumed that the wanted line is inthe first groupoflines terminat= ing in the connector switch under which as sumption oneimpulse of current will be transmitted by the. dial sender to cause theconnector switch to take a setting in operative relation to thefirst'group of lines termiating at thefswitch. It will then be as sumedthat the, wanted line is in the second groupaof lines terminating at theconnector under which condition it-willbe necessary to transmit fiveimpulses, and lastly it will he assumed that the wanted line is in athird group of lines at the connector switch.

and" the change-over relay 40. Brushes and 36 areclosed inpredeterminedintervals and-the circuit is completed through brush whenever thecircuit is closed through brush 35. In the case of the change-overoperation it is necessary that the controller remain in one positionduring a series of impulses," but to advance out'of this position Itthereforebecomes necessaryto measure an intervaloftime greater than thatbetween two impulses of a series, in which interval the' control switchmust not. be advanced, but when .a period longer thanrthis intervaltranspires the circuit must be'closed to ad- Vance the controller toasucceeding position. It will appear further in, the description thatduring t-he receipt of a series of imnulses' lhc circuit will be;intermittently closed through the right-hand winding ofthe changeoverrelay 4 0', and alocking circuit i through the right-hand winding ofthis, re.-'

lay is intermittently closed atthe brush 35, v

so that itimay happen during-the period of receivi'ngthe seriesofimpulses that the frelays 4:0 will haveitsarmaturkes retracted whichis one of-th'e conditions necessaryto cflect the change-over, -but atthis time the circuit willbe open at brush" 36. In order to' effect thechange-over the circuit must be? opened through the right-hand windin-gof the change-over relay and anj -interval ot' time must ha'velapsedsufficient toopen the T i i circuit throughlbrush 35 before-the circuitcontrolling the change over extending through brush 36and theright-handarmature and back contact of relay a0.- is efiec'tive.

similar time interval is measured for, con-i trolling thereleaseoperation and this like-i wise will appear from the followingdescription; V r r r 7 v Sinceit hasibeen assumed that the wanted lineis in thefir'st groupoflinesterminat transmit one impulse correspondingtothe first digit of the wanted imember. The step ping relay SR willretract-its armatureonce and-then remain: energized until the units.Ihis will'appear; from the furtherdescription of OPGIYHIIOILOfthGconnector switch. A V 851 Y series of impulses." When the stepping relaySR=retracts its armature, it opens the" energizing circuit of therestoring relay 34; This relay will be locked energizedthrough its: lefthand winding if interrupter brush 9" is connected to ground; Ii,however, the interrupter brush '35 is not closed" to ground,

the restoring relay will close a break point in the restoring circuitatits armature and back -contact,- but before-interrupter brush 36 isclosed 'togroundto comp'lete this cir cuit after groundhas been removedat interrupter 35, the stepping-relay SR will attract its armatures to'energize relay 34 again. Therefore the restoring circuit for theconnector switch controlled at the'b'ack contact andarmature of th'erestoring relay the stepping relay SR retracts its armatu'resinf-response to an impulse :correspond- 34 is ineffective as long asthecalling party 7 has his receiver fro-mats switchhook; When w ing' tothe-tens digit of the wanted number,

the'motor magnet- 15 ofthe controller is en-f er'gized in l a circuitcompleted 7 from grounded battery winding of this magnet,- conductor 27;armature and back contact ofthe motor magnet, the right hand winding ofrelay- 37, conductor 38, the controller brush 22 in its normal position,conductor 26; armature "39 and; back contact of'relay 37, righthandwinding of relay lO,-' iriner right hand, tron-t contact andarmature of relay 17,1-innerback contactand armature F of stepping relaySR to' ground;' Themotor magnet 15.1an1d the. relays 40 and '3Zv'are on90: ing at'thescon'nector, the subscriberwill then 'ergized for arelatively long interval after crgized in this circuit. Relay 37locksitself energized through its left hand winding, front contact andarmature. The right hand winding of this relay is opened at this time atits outer right. hand contact and arma-;

ture 39. Relay has a locking circuit intermittently closed throughitsleft hand winding, front'contact and armature tointerrupter brush 35. fvllhen the stepping relay SR is energized at the close otthis impulse,it will interrupt theoperating circuit oi the motor magnet15-p'reviously descr bed,

causing this magnet to' deenergize arijdadvance the controller brushesto positionone. 'lhe change-over relay lO will remain. en-

the transmission of the'tensim'pulse or impulses,:so that theinterrupter brush 36 will have an opportunity to extend. ground to theinner right hand armature and front contact of relay37 to short circuitthisr'elay and cause itsdeenergization. Y

The calling subscriber may now operate his dial sender totransmitimpulses corresponding to the units digit ofthe wanted number.In response to each impulse transmitted, the stepping relay SR willvibrate its armatures.- vIn response to the first impulse of the unitsseries, the motor magnet of the controller will be operated to advancethe controller. to position 2 over a circuit closedfrom: groundedbattery, winding of this magnet, conductor 27, outermost right handfront, contactcand armature of relay 1?, conductor 11, uppermost backcontact and armature of relay" 21, controllerbrush 12 in positionone,conductor 43, right hand winding of relay 1a, conductor 45, brush 22 inposition 1, conductor 26, armature 39 and back contact of relay 37,right hand wind ing of the changer-over relay 40, innermost right handfront contact and armature of relay 17,'inner back 001115210 3andarmature of the steppingzrelay' SR to ground. The motor magnet 46 ofthe connector is also energized at this time in a circuit extending fromgrounded battery, winding of thermotor magnet, conductor 4&7" and inmultiple with the circuit previously described, over position one.Thereafter each time that the stepping relay SR retracts its armature,it closes a circuit from ground, ts inner right hand armature and 'bacl;contact, in-

nermost righthand armatureand front con- Y tact 0t relay :17, right handwindingfof relay 40, armature 39 and'backcontactof reg; v lay 37,conductor 26, brush 22 of the con r troller in its secondposition,conductor e7,

. winding of the motor magnet Q6 of thecon nector to grounded battery, 7in response to 7 each of theremaining impulses transmitted tothesteppingrelay the motor magnet 16p the connector'advances the connector.

brushes progressively;

It will inowbe assumed the wanted line is in gthe second group of linesat the connector switch. It w ll therefore be necessary for the callingsubscriber .to operate] his dialse'nderto transmit a ,tens series-of Itwill be remembered thecasecwhere a single tens impulserwas transmittedthat.

the motor magnet 15 caused the controller a brushes to move to positionone, andthatthe relay 37 was locked energized until. the

change-over was efi 'ected. at the close of the tens seriesot impulses.v In the present instance when the. subscriber transmitsffive' impulsesfor the tens digit, the motor mags net 15 of the controller will movethe brushes of this switch one step for eachim- 7 pulse received, andwhen the controller reaches position two, a circuit is closed forthemoto-r magnet 16 of the connector, conductor 17 and over conductor4:3 in multi ple with the operating circuit of the motor' magnet 15 ofthe controller. Inresponse to the second, third,and fourth impulses fromthe substation dial sender, the controller will be advancedthroughpositions two, three and four. The controller will be advanced slowlythrough these positions,

since its operation is controlled at the dial sender and while it isbeing thus advanced, acircuit will be closed for. a suff cient intervalof time to advance the connector brushes to the last line of the firstgroup of lines terminating at the connector. I This circuit foradvancing the connector to the last position I of the first group oflines extends ,from grounded battery, windingof theimotor magnet 46,connector brush 50 in its positions one to six inelusive,rconductors 51and 52, controller brush 53 in its positions two, three and four,conductor 69, upper middle armature and back contact of relay 21, con-Iductor 54, left hand front contact and arma-- ture of relay 37 toground. At the close of the tens series of impulses, the relay 37 willbe short .circuited as in the case previously described, and theimpulses of the second or units digit will be recorded directly on theconnector to advance this switch to" the wanted line in the selectedgroup.

If the wanted line is in the thirdgrou of lines terminating at theconnecto'n-the rst or tens digit of the wantednumber will be 9. Theoperations previously described in connection. withthe selection of thefirst and second groupsof lines at the connector will take place, andwhile the controller is being. advanced through positions six, seven 7group, the designation of which is 9. If the called line is idle whenthe test is made,

- there will be no ground potential on the test terminal of the wantedline with which the test brush of the connector is in engage inent.

Since the controller at t'he time of testing the wanted lineremains inthe position to which it has been advanced during the tens series ofimpulses andthe change-over at the conclusion of this series ofimpulses; the

controller willbe standing in positions'two,

six or ten depending upon whether the tens digit was one, five or nine.At the time of the change-over the relay 44 is short circuited by groundat interrupter'brush 36 and deenergizes to close a circuit fromground,': resistance, brush 36 of the interrupter, armature and backcontact of relay 40, inner right hand armature and back contact of relay37, right hand back contact and armature of relay 44, conductor 78,innermost upper back contact and armature of relay 21, conductor 56,armature and back contact of relay 57, conductor 58,brush 42 inpositions two, six' or ten, conductor 72, uppermost armature and backcontact of relay 21,

conductor 41, armature and front contact of relay 17 conductor 27,Winding of the motor magnet 15 of the controller to grounded battery.Under the control of this circuit the motor magnet advances thecontroller brushes one step, moving them to positions three, seven oreleven depending upon the position of; the brushes duringflthe'testing'of the wanted line.

The relay 21 is energized in a circuit extending from ground,resistance, interrupter brush 36, right hand armatures and back contactsof relays 40, 37 and 44, conductor 78, innermost upper back contact andarmature of relay 21, conductor 56', armatureand back contact of relay57.

conductors 58 and 59, upper winding of relay 21, conductor60,-controller brush 42 in positions three, seven or eleven, upperarmature and back contact of relay 21 to grounded battery over conductor41 and motor magnet '15. The-relay 21 is operated in this circuitandcloses alocking circuit for itself throughits lower winding, innermostlower front contact and armature which close before associated contactson this: relay break, conductor 61 outer left hand front contact andarmature of relay 7 17 "to ground. "Relay 21 connects' a guard-7 ingpotential to thetest brush'55 to make the test terminal of'the calledline busy and to operate the cut off relay of the'c alled line hereinshown as a resistance designated 62. The relay 21 closes a circuit tomove the controller switch -past' positions three, four, seven, eight,eleven and twelve, if this switchhas'not already bcenadvanced past thesepositions. This circuit is traceable from grounded battery, Winding ofthe'motor magnet 15 of'the controller, conductor 27 back contact anda'imature'of motor magnet 15, conductor 63, lowermost front contact andarmature of relay 21, brush 20 of the'controller in positions three,four, seven, eight, eleven and twelve, conductor 64, continuity spring65 and middle lower armature o'f relay'2l to ground; The relay 21alsocloses a circuit to advance thecontroller switch past positions five,sixpnine andten depending upon which position the controller 'wasstanding at the close of the testing operation. The-l'ast named circuitis completed from grounded battery, winding of the motor magnet 15 ofthe controller, conductor 27, back contact and armature of this magnet,conductor 63,

lowermost front contact and armature of thirteen and the calledsubscriber 'will be signaled over a circnitcompleted from the ringingmachine 67, trip relay 68, controller brush 53 in its thirteenthposition," trunk conductor "69, middle upper armature "and front contactofrelay 21, connector brush,

70, through the lower side of the called line and bell at the calledstation, upper side of the called'line, connector brush '71, uppermostfront contact and armature of relay 21,

trunk conductor 7 2, controllerbrush 42 in its thirteenth position toground; The slow releasing trip relay 68 is marginal and does notoperate in this circuit until the called partyresponds. It willthereupon receive 7 sufficient current to energize and: attract its c 1i armature to, close a c rcu t from'ground, its

armature and'front contact, controller brush 20 in its thirteenthposition, lowermost armature and front contact of relay 21, conductor63, armatureand back contact of the motor magnetlfi'of the controllenconductor 27 winding'of this magnet to grounded battery'u The no tormagnet 15 interrupts its own circuit to advance the brushes ofthecontroller into their fourteenth or talking position;-

Talking battery for the calling partyv supplied through the windlng ofthe step ping relay SR, while the. talking battery tor thecalledsubscriber is suppliedthrough the winding of the relay 57.

- In the event that the called line is busy when tested, the test brushof the connector will encounter a ground potential on the test terminalof this line; This will cause the operation of the relay 57 of Fig. 1,over a circuit'closed from grounded battery, left hand winding of relay57, continuity spring 73 and outer left hand armature of relay 44,

- conductor 74, test brush 55 to ground at the connector switch whichhas previously seized the'wantedline. When the changeover takesplace atthe close of theltens series of impulses, interrupter brush 36 closes acircuit from ground through the right hand armature and back contact ofrelay 40, inner right hand armatureand front contact of relay44 whichshunts the relay 44 and *back contact of relay 21 to ground.

Thebusy tone is now transmitted to the calling party to inform him thatthe wanted line is, engaged. This tone is sent over a circuittraceablefrom ground, winding of the transformer, brush 36 of the interrupter,right hand armature andback contact of relay 40, inner right handarmature and back contact of relay 37, outer armature and back contactof relay 44, conductor 78, innermost upper back contact and'armature ofrelay 21,- conductor56, outer armature and front contact of relay 57over the upper side of the trunk, and calling line andsubstationcircuits,-over the lower side otthe line and trunk circuits, continuityspring73 and back contact of relay 44, inner armature and front contactof relay 57, conductor 75, back contact and continuity spring of relay21,

. controller brush 20 in positions two, six or ten, lowermost armatureand back contact of relay 21 to ground. The testing operationjustdescribed takes place in the samemanner irrespective of whether thecontroller is standing in positions two, six or ten, since the samecircuits are established at each of these points in multiple. V I

If the calling party should again operate :his dial sender afterreceiving the busy indi- .cation, the connector switch will be advancedbut the controller will remain in its testing position, that is, inpositions two, six or ten so that no disturbance will result from thislast mentioned operation.

this relay to retract its armatures.

sition fourteen.

When thecalling' party replaces his re,- ceiver on theswitchhookeitherbecause he has terminated his conversation or desires to abandon thecall, the stepping relay SR will. have its energizing circuit opened andwill retract its armatures. This will open the energizing circuit of theright hand Winding of relay 34, and when interrupter brush 35'disengages its contact, the left hand winding of relay34 will bedeenergized permitting In the course of the operation of theinterrupter,

ground will be applied over brush 36, armature and back contact of relay34, inner left hand front contact and armature of relay j 17,resistance, to grounded battery. This circuit shunts the relay 17,causing it to deenergize and retract its armatures. At theouter lefthand armature andffrontcontact.

of this relay the locking circuit of relay 21 including conductor 61iso-pened,causing this last named relay to retract its armatures. Alsoat this same armature and front 7 contact of relay 17 a" holding circuitfor the cut-0H relay. including conductor 30 is opened, removing theguarding potential from the called terminal of the calling line at theconnector, and also causes'its cut-off i relay to reconnect the linerelay to the line.

.At' the middle armature .and continuity spring 18 ofrelay 17, theholding circuit for therelay 8 including conductor 32 is opened todisconnect the line brushes of the finder from the trunk, After the,release of relays 17 and 21", the controller is advanced to po- 7 Groundis connected through the lowermostarma-ture and back contact of relay 21to the controller brush 20, and when this brush is standing in positionsone, two, five, six, nine andten, it will close a circuit over conductor80, back con t acts and armature 81 of relay 17, armatureand backcontact of motormagnet 15 of the cont-roller, conductor 27, winding of ii this magnet to'grounded battery. Under the control of/[his circuit thecontroller will be advanced through the last named positions. l Thecontroller is also advanced pastposi tionsthree, 'four, seven, eight,eleven and twelve over a circuit closed from ground at the back contactof the stepping relay SR, innermost right hand armature and back contactof relay l7,,conductors 82 and 83,

brush 22 of the controller inpositions three,

four, seven, eight, eleven and twelve, con-' ductor 26, armature 81 andback contactof relay 17, back contact and armature of the motor magnet15 of the controller, conductor I 27 winding of this magnet to groundedbat tery. Whenthe brush 22 of the controller is standing in itsthirteenth posit-ion, ground is applied over conductor 26, and thearmature 81 and contact. of relay 17, armature and back contact ofmotor.magnet 15, con ductor 27, winding of magnet 15 to ground-' ed battery toadvance the controllerto position fourteen.

The connector is advanced. past points '1 to 6 inclusive, by acircuittraceablc from ground, outer left hand armature and back contactof relay l7,' outer armature and back contact of'the stepping relay SR.conductors 85 and 51, brush in positions 1 to 6 inclusive, back 2contact, armature magnet 46 to grounded battery, The connector isadvanced past positions 15 to 25 by an operating circuit closed fromgrounded battery, winding, armature an'dba'ek contact of this magnet46,'connector brush 5 0 in positions 15to 25 inclusive, conductor 86,controller brush 20 in position fourteen,;lowermost'armature I and backcontact of relay' 21 to ground. The connectorhas now been advanced toits home posltionand a oncuit 'is thereupon completed from ground,

through connector brush71, conductor 87 controllerbrush 22 in itsfourteenth position, conductor 26, armature '81 of 'relay"17, armatureand back contact of'tlie motor magnet 15 of the controller,conductor 27,winding of this motor magnet-to grounded battery. Under the control ofthis circuit,

7 the controller advances its brushes to their so-called home position.

It will thus be seen that a controller or sequence controlling devicehas been 'provided which also functionsasa register and translatingdevice andwhich "stores a portion of the wanted number, and thereuponcauses its associated connector switch to be adjusted to apositioncorrespondingto the number as translated by said device. 4

What I claim is: i I

1. In a telephone system, an incoming line. a plurality ofoutgoingljines, an automatic switch for interconnecting said incomingline with any of said 'outgoing lines, and a progressively movable"registering switch individual to said automatic switch and operateddirectively from a distant point to cause said automatic swi'teh to takea desired setting other'than thatindicated by said means. Q

2. In a telephone system,fan "incoming line, a plurality of outgoinglinesyan automatic switch for interconnecting said incoming line withany of said OUtQUlIIQllHGS,

and. a progressively movable translating de- 7 vice individual to saidautomaticswitch and operated directive-1y from i a distant point tocause said automatic switch -to'take a: desired setting other than; thatindicatedby said translating'device'i 1 3.'In *aitelephone system, anincoming line, a plurality of outgoing lines, an automatic switchforinterconnecting said in- :oming line with any of said-outgoing lines,and a progressively movable combined sequence controlling device andtranslating mechanism individual to said automatic switch andoperated'directively froma dis tant point to cause saidswitch to take adesired setting other than that indicated by saidcontrolling deviee andtranslating mechanism. "m n 1 4. In a"'telephon e system, an incomingline, 'a variably "adjustable impulse sender associated with said11118,: a" plurality-of i outgoing lines, an automatic switch for in!terconnecting said incoming line with. any;

of said outgoing lines, andaprogressively movable translating switch'i'ndividualto' fsaid automatic switch and directively con-- trolled over'saidincoming line to take a settlng in accordance with the ad ustmentof said impulse sender, saidautomatic switch during a portion of-itsoperation being controlled by said translating means to take a desiredsetting otherthan thatins dicated by said impulse sender.

line, a variable adjustable impulse sender associated with said line. -aplurality ofoutgoing lines, an automatic switch for interconnecting saidincoming line with any of said outgoing lines, a progressivelv movabletranslating'switch individual to said-switch 5. Ina telephone system, anincoming and *directively controlled iovernsaid-"iin coming-line totake'a setting inlaccordance with the adjustment of saidimpulse sender,said automatic switch during a "portion of its operation beingcontrolled by said translating means to take a desired setting otherthan that indicated. by said impulse sender, and during the remainder ofits movement set in accordance with the ad-;

justment of said impulse'sender, i I -6. In a telephone system, anincoming line, a plurality of outgoing lines arranged. in groups,an'automatic switch operable through group and line selecting movementsto interconnect said incomingflin'e with any of said outgoing lines, anda progressively movable translating device individual to said switchvand directively controlled hover saidincoming' line to cause said switch:to select a group of outgoing linesiother than that indicatedbythes'etti-ng ofs'aidtranslating device, said automatic switch being.

line, a -plurality o't outgoing'lines arranged 'directivelv controlledduring 'its' .line sel'ectin "groups, automatic switch. operatineff 130through line andlgroupselecting movements system, an incoming vice, saidautomatic switch beingdirectively controlled during its line selectingmovement. I p

8. In a telephone system, an incoming line, a plurality of outgoinglines, an automatic switch for interconnecting said incoming line withany of'saidoutgoing lines, a progressively movable controlling switchindividual to said automaticswitch and operating circuits inmultiple-for said'switches directively' controlled over said incomingline.

r 9 In a'telephone system,itelephone lines, trunks for interconnectingsaid telephone lines terminating in numerical switches, a finderswitch'operating on the initiation of a call over any of said telephonelines to connect its trunkline to the calling line, controller switch.for maintaining said trunk normallyopen at points between its finderand numerical switch 'and' means controlled over said incoming line fordirectively operatin said controller switch to 'overn the setting ofsaid numerical switch.

' 10. Ina telephone exchange system, a selector switch having fixedterminals and moving contacts co-operating therewith, groups of linesconnected to said terminals, other terminals being allotted for groupsolection, lines'of said groups and said group selection terminals beinginterspersed in order of their appearance and means including almechanical timing device associated with said selector switch formoving said contacts over said terminals to select an idle line. r 7

11. In a telephone exchange system a selector switch having a terminalbank, groups ofsubscribers lines connected to certain terminals of saidbank, other terminals being allotted for group selection, directively{controlled means for moving the switch over certain of said terminalsand terminals of one of said groups, said means including a rotatingtiming device associated with said selector switch and means forautomatically moving said switch over terminals in another group toselect another group for a line selecting operation therein. v 12. In atelephone exchange system, a selector switch having a terminal bank,groups of subscribers lines connected to certain terminals of saidbanks, other'terminals being allotted for g'roupselection, directivelycon trolled means for selecting one of said other terminals, saidmeansincluding a mechanicaltiming device associated with said seforselecting a group decimally and auto-- matically, and means forthenselecting a line decimally, certain of said means includ ing amechanical timing device associated with said selector switch.

14. In a telephone exchange system, a

switch havin a movement in a sin le )lane, D 23 v a wiper for saidswitch, groups of subscribers lines terminating in, said switch, saidsubscribers lines being decimally designated and means. responsive to anumber of impulses to step said wiper toselect a group of lines and aline in said group, the steps ofsaid wiper. in its group andlineselecting movements being of equal length, said means including amechanical t ming device assoto a plurality of said selector switches15. In a telephone system, a plurality of ,incominglines, a trunk line;an automatic switch having. movable brushes and contacts forinterconnecting said trunk line with any incoming line over which a callis being extended; a line relay and a cut-off relay for each incomingline; sets of contacts for said relays controlled by the energizationthereof; an operatingcircuit for said line relay,

extending on the initiation of a call over its incoming line through twosets of contacts of its associated cut-ofit'relay over the two sides ofan incoming line in series; a resistance, a battery-and a double woundrelay at said switch; (LII'OPBIatlIIg magnet for advancing said switchprogressively; a circuit'for said motor magnet extending from one sideof said battery through said resistance, the -winding of said motormagnet and contacts of said double wound relay to the opposite side ofsaid mentioned battery; a circuitm multiple of that last describedextending through one winding of said double wound relay, through2L'1I10V2Lbl6 brush and contact of said automatic switch and contacts ofsaid line relay to ground, said last mentioned circuit 'beingeffectiveco-shunt the motor magnet to stop the operation of said switch and alsobeing effective to energize said double-wound relay; and a holdingcircuit through the second winding of said double-wound relay formaintaining the connection completed. V 16. In atelephone system, aplurality of incoming lines; a trunk line; an automatic switch for saidtrunk line for connecting the same with any of said incoming lines onthe extension of a call thereover; a single-wound cut-oil relay and asingle-wound ciated with said selector switch and common 9 line relayfor each incoming line; sets of contacts for each of said relays; anenergizing circuit for said line relay completed on the initiation of acall over one of said incoming lines, said circuit including the windingof said linerelay, pairsof contacts of said cut-ofi' relay and the twosides of said incoming line in series; a motor magnet for advancing saidswitch progressively to suecessively extend said trunk line to saidincoming lines, a double wound relay a-ssoci-V ated with said trunk,said double wound relay having a set of contact springs arranged to beopened bythe operation of said double wound relay; a source of battery;an energizing circuit for said motor magnet extending from-one side ofsaid source of battery through the winding of said motor magnet andthrough the contact springs of said double wound relay; an operatingcircuit including one windingof said double wound relay and including aportion of the operating circuit of the motor magnet; said lastmentioned circuit being closed when said trunk line is extended to acalling incoming line to stop the operation of said motor magnet; acircuit for said cut-oi? relay completed through said switch when saidtrunk line is being connected to the calling line; and a holding circuitfor maintaining the connection, completed through the second winding ofsaid double wound relay.

17. In a telephone system, a plurality of incoming lines; a trunk line;an automatic.

for each of said relays; an energizing circuit for said lineirelaycompleted on the initiation'of a call over its incoming lines, saidcir-.

cuit including the winding of saidline relay, pairs of contacts of saidcut-off relay and the two sides of sald incommg line in series; a motormagnet for advancing said switch progressively to successively extendsaid trunk line to said incoming lines; a clouble wound relayassoclated-with said trunk,

said double wound relay having aset of contact springs arranged to beopened by the operation of said double wound relay a battery, anenergizing circuit for said motor wound relay; an operatin circuit forsaid double wound relay ncluding one winding ofsaid double 'wound relay,and including a portion of the operating circuit of the motormagnet,.said last mentioned circuit being completed at normally opencontacts of said line relay, said last mentioned circuit being closedwhen said trunk line is extended to a calling incoming line to stop theop'er-,

ation of said motor magnet; a circuit for said cut-off relay completedthrough said pri mary switch when said trunk line'is being "Connected tothe calling line; and a holding circuit for maintaining the connection,com pleted through the second winding of said double wound relay. I

In witness whereof, I hereimto subscribe my name this-24th day ofOctober, AJD. 1919.

WINFRED T. POWELL,

